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Thermoreflectance of metal transducers for optical pump-probe studies of thermal properties
Open accessAbstract
We report measurements of the temperature dependence of the optical reflectivity, dR/dT of fifteen metallic elements at a wavelength of λ = 1.03 μm by time-domain thermoreflectance (TDTR); and the thermoreflectance of thin-films of Pt, Ta, Al, Au, SrRuO(3), and LaNiO(3) over the wavelength range 0.4 < λ < 1.6 μm using variable angle spectroscopic ellipsometry. At λ = 1.03 μm, Al, Ta, Re, Ru, have high values of thermoreflectance, dR/dT > 6∙10(-5) K(-1), and are good choices as optical transducers for TDTR experiments using a Yb:fiber laser oscillator. If low optical reflectivity and the associated high degree of steady-state heating are not a concern, LaNiO(3) provides an exceptionally sensitive thermometer in the infrared; (1/R)(dR/dT) > 2.5∙10(-4) K(-1) in the wavelength range 0.85 < λ < 1.3 μm. This compilation of data will assist in the design and interpretation of optical pump-probe studies of thermal properties.
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“For a Ti:sapphire oscillator centered around 800 nm, an Al thin layer with a thickness of ~100 nm is a common choice as the transducer layer due to its strong absorption (the 99% absorption depth is <60 nm) 104 and an exceptionally large thermoreflectance coefficient d R /d T ~ 10 -4 K -1 at the 800-nm wavelength. 98, 105, 106”
From Tutorial: Time-domain thermoreflectance (TDTR) for thermal property characterization of bulk and thin film materials (2018) · cites this paper as [98]
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Metadata
- Authors
- Wilson, R. B., Apgar, B. A., Martin, L. W., & Cahill, D. G.
- Affiliations
- University of Illinois Urbana-Champaign (US)
- Venue
- Optics Express
- Publisher
- Optica Publishing Group
- Published
- 2012-12-12
- Volume
- 20
- Issue
- 27
- Pages
- 28829
- ISSN
- 1094-4087 (ISSN-L)
- OpenAlex
- W1985630444
- Cited by
- 160
- References
- 23
- Citations by year
- 2026: 16 · 2025: 19 · 2024: 11 · 2023: 15 · 2022: 12 · 2021: 21 · 2020: 16 · 2019: 6 · 2018: 8 · 2017: 11 · 2016: 6 · 2015: 6 · 2014: 8 · 2013: 5
- FWCI
- 8.03
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Optics Express (publishedVersion)
- PubMed (publishedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- Topics
- Physical Sciences › Engineering › Mechanics of Materials › Thermography and Photoacoustic Techniques
- Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
- Physical Sciences › Engineering › Civil and Structural Engineering › Thermal Radiation and Cooling Technologies
- Keywords
- thermoreflectance, time-domain thermoreflectance, optical reflectivity, thin metal films, infrared thermometry, LaNiO3, SrRuO3, platinum, tantalum, aluminum, gold, optical transducers, thermal properties, optical pump-probe, spectroscopic ellipsometry
- MeSH terms
- Equipment Design, Lasers, Lenses, Light, Metals, Scattering, Radiation, Temperature, Thermal Conductivity, Transducers, Equipment Failure Analysis
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